diff options
Diffstat (limited to 'source/luametatex/source/libraries/softposit/source/ui64_to_pX1.c')
| -rw-r--r-- | source/luametatex/source/libraries/softposit/source/ui64_to_pX1.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/source/luametatex/source/libraries/softposit/source/ui64_to_pX1.c b/source/luametatex/source/libraries/softposit/source/ui64_to_pX1.c new file mode 100644 index 000000000..663983084 --- /dev/null +++ b/source/luametatex/source/libraries/softposit/source/ui64_to_pX1.c @@ -0,0 +1,124 @@ + +/*============================================================================ + +This C source file is part of the SoftPosit Posit Arithmetic Package +by S. H. Leong (Cerlane). + +Copyright 2017 2018 A*STAR. All rights reserved. + +This C source file was based on SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3d, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of +California. All Rights Reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdint.h> + +#include "platform.h" +#include "internals.h" + +posit_1_t ui64_to_pX1 ( uint64_t a, int x ) { + int_fast8_t k, log2 = 63;//60;//length of bit (e.g. 576460752303423488 = 2^59) in int (64 but because we have only 64 bits, so one bit off to accommodate that fact) + union ui32_pX1 uZ; + uint_fast64_t uiA=0; + uint_fast64_t mask = 0x8000000000000000, frac64A; + uint_fast32_t expA; + + //NaR + if (a == 0x8000000000000000 || x<2 || x>32) + uiA = 0x80000000; + else if (x==2){ + if (a>0) uiA=0x40000000; + } + else if ( a > 0x8000000000000000){//576460752303423488 -> wrong number need to change +uint64_t test = ((uint64_t)0x80000000>>(x-1)); +printBinary(&test, 32); + uiA = 0x7FFFFFFF & ((uint64_t)0x80000000>>(x-1)); // 1152921504606847000 + } + else if ( a < 0x2 ) + uiA = (a << 30); + else { + frac64A = a; +//printBinary(&frac64A, 64); + while ( !(frac64A & mask) ) { + log2--; + frac64A <<= 1; + } +//printf("after regime:\n"); +//printBinary(&frac64A, 64); + k = (log2 >> 1); + + expA = (log2 & 0x1) ; +//printf("expA:\n"); +//printBinary(&expA, 32); + frac64A = (frac64A ^ mask) <<1; +//printf("frac64A:\n"); +//printBinary(&frac64A, 64); +//printf("log2: %d k: %d\n", log2, k); + + + + if(k>=(x-2)){//maxpos + uiA = 0x7FFFFFFF & ((int32_t)0x80000000>>(x-1)); + } + else if (k==(x-3)){//bitNPlusOne-> exp bit //bitLast is zero + uiA = (0x7FFFFFFF ^ (0x3FFFFFFF >> k)); +//printBinary(&a, 64); +//printBinary(&uiA, 32); + if( (expA & 0x1) && frac64A ) //bitNPlusOne //bitsMore + uiA |= ((uint32_t)0x80000000>>(x-1)); + } + else if (k==(x-4)){ //bitLast = regime terminating bit + uiA = (0x7FFFFFFF ^ (0x3FFFFFFF >> k)) | (expA<< (28 - k)); +//printBinary(&a, 64); +//printBinary(&uiA, 32); + mask = (uint64_t)0x800000000 << (k + 32-x); +//printBinary(&mask, 64); +//printBinary(&frac64A, 64); + if (mask & frac64A){ //bitNPlusOne + if (((mask - 1) & frac64A) | (expA&0x1)) { + uiA+= ((uint32_t)0x80000000>>(x-1)); + } + } + } + else{ + uiA = (0x7FFFFFFF ^ (0x3FFFFFFF >> k)) | (expA<< (28 - k)) | ((frac64A>>(k+36)) & ((int32_t)0x80000000>>(x-1))); +//printBinary(&uiA, 32); + mask = (uint64_t)0x800000000 << (k + 32-x); //bitNPlusOne position + if (mask & frac64A) { + if (((mask - 1) & frac64A) | ((mask << 1) & frac64A)) { + uiA+= ((uint32_t)0x80000000>>(x-1)); + } + } + } + } + uZ.ui = uiA; + return uZ.p; +} |